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My laptop is connected to an external monitor via DisplayPort(in a port in the docking station). When I boot my laptop while it is connected to the docking station everything works fine, but if I detach the laptop from the docking station and reattach it, the external monitor does not wake up. It does recognize something happened, as it display a power-saving mode message, but, but it remains black. The laptop itself thinks it's connected, as it switches to the multi-monitor mode.

I'm running Arch Linux on a Dell Latitude E7440 with kernel version 3.16.1-1-ARCH and KDE 4.14.0. I have the xf86-video-intel driver installed. I'm using kscreenfor monitor management, but even if I go to the system settings to set it up manually I can't wake up the screen.

When I connected the same screen via DVI it worked fine.

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The solution was to install Laptop Mode Tools.

  • Thanks for the tipp. It also solved the problem that from time to time one of the external monitors wouldn't wake up properly after energy saving mode. With laptop-mode-tools, I now can plug the laptop out of the docking station and back in to fix it. – Fabian Schmengler Mar 28 '18 at 12:04
  • BTW - I can't confirm it, but I believe Laptop Mode Tools also help regulation the cooling mechanism, preventing overheating. – Idan Arye Mar 29 '18 at 16:31

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